﻿namespace MicroCloud.Data
{
    /// <summary>
    /// 将<see cref="long"/>转换为<see cref="string"/>字符串值和从<see cref="string"/>字符串中转换。
    /// </summary>
    public class StringLongConverter : JsonConverter
    {
        #region "构造函数"
        /// <summary>
        /// 初始化一个 <see cref="StringLongConverter"/> 的新实例。
        /// </summary>
        public StringLongConverter()
        { }
        #endregion

        /// <summary>Writes the JSON representation of the object.</summary>
        /// <param name="writer">The <see cref="T:Newtonsoft.Json.JsonWriter" /> to write to.</param>
        /// <param name="value">The value.</param>
        /// <param name="serializer">The calling serializer.</param>
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            serializer.Serialize(writer, value?.ToString());
        }

        /// <summary>Reads the JSON representation of the object.</summary>
        /// <param name="reader">The <see cref="T:Newtonsoft.Json.JsonReader" /> to read from.</param>
        /// <param name="objectType">Type of the object.</param>
        /// <param name="existingValue">The existing value of object being read.</param>
        /// <param name="serializer">The calling serializer.</param>
        /// <returns>The object value.</returns>
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            //var jt = JToken.ReadFrom(reader);
            //var values = jt.Values();
            //return values;
            var valueType = reader?.Value?.GetType();
            var value = Equals(valueType, objectType) ? reader.Value : reader?.Value.CastTo(objectType);
            return value;
        }

        /// <summary>
        /// Determines whether this instance can convert the specified object type.
        /// </summary>
        /// <param name="objectType">Type of the object.</param>
        /// <returns>
        /// 	<c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
        /// </returns>
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(long) || objectType == typeof(ulong) || objectType == typeof(long?) || objectType == typeof(ulong?);
        }
    }

}
